From a13db641998bb15b3641f223958746f6b00b0b4d Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@redhat.com>
Date: Fri, 24 May 2019 10:10:59 +0200
Subject: [PATCH] bpo-37031: Fix PyOS_AfterFork_Child()

PyOS_AfterFork_Child(): _PyInterpreterState_DeleteExceptMain() must
be called after _PyRuntimeState_ReInitThreads().

_PyRuntimeState_ReInitThreads() resets interpreters mutex after fork,
mutex used by _PyInterpreterState_DeleteExceptMain().
---
 Modules/posixmodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 8ebe3a0be053501..cd5b5ce082ece42 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -448,11 +448,11 @@ PyOS_AfterFork_Child(void)
 {
     _PyRuntimeState *runtime = &_PyRuntime;
     _PyGILState_Reinit(runtime);
-    _PyInterpreterState_DeleteExceptMain(runtime);
     _PyEval_ReInitThreads(runtime);
     _PyImport_ReInitLock();
     _PySignal_AfterFork();
     _PyRuntimeState_ReInitThreads(runtime);
+    _PyInterpreterState_DeleteExceptMain(runtime);
 
     run_at_forkers(_PyInterpreterState_Get()->after_forkers_child, 0);
 }